JP2018151092A - Conductive heat transfer dryer having improved efficiency of transferring heat to treatment object, and method of operating the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a novel conductive heat transfer dryer equipped with a multitubular heating pipe, capable of improving dispersibility of treatment objects and of accelerating efficient drying of treatment objects by preventing the treatment objects from corotating in the body shell of the dryer.SOLUTION: A conductive heat transfer dryer 1 provided with a heating device disposed in its body shell 10 vaporizes moisture by allowing treatment objects P to contact the heat transfer surface of the heating device. The heating device is a multitubular heating pipe 11 having a rotary shaft set along the longitudinal direction of the body shell 10, and is constructed in such a manner that a treatment object P1 in an advanced stage of drying lifted by a plurality of lifters 117 attached to the side peripheral part of the multitubular heating pipe 11 can be extracted from an extraction port 120 formed on the side peripheral part of the body shell 10 and the treatment object P1 in an advanced stage of drying can be conveyed to a suitable place in the body shell 10 during its operation.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a device for drying and concentrating materials such as mud, cake, and granular materials and liquid materials, and particularly for improving heat transfer efficiency in a conductive heat transfer dryer. Conductive heat transfer dryer with improved heat transfer efficiency to the object to be processed, which can avoid problems caused by the object to be processed supplied to the tube being rotated together with the multi-tube heating tube, and its operating method It is related to.

FIG. 8 shows a conduction heat transfer dryer 1 ′ which is one of apparatuses for drying materials such as mud, cake and powder. In this apparatus, a heating device (multi-tubular heating tube 11 ′) is provided in a main body shell 10 ′, and the workpiece P is brought into contact with the heat transfer surface of the heating device to evaporate water in many cases. It is used for the purpose. The present applicant has also manufactured and sold such a conductive heat transfer dryer 1 ', and has further developed a drying apparatus to which the conductive heat transfer dryer 1' is applied, and has already filed a patent application. (For example, refer to Patent Documents 1 and 2).
And after that, the present applicant has eagerly improved and developed the conduction heat transfer dryer and the drying apparatus, and found that there is room for improvement in the following points.

That is, in the conductive heat transfer dryer 1 ′, the object P (water content 50 to 80% as an example) charged into the main body shell 10 ′ from the charging port 101 ′ is the heat transfer of the multi-tube heating tube 11 ′. The moisture content decreases in contact with the surface, and as an example, the moisture content is about 10 to 20%, and is discharged to the outside through the discharge port 109 '.
At this time, in a state where the drying of the workpiece P has progressed to some extent (as an example, a water content of 30 to 40% WB), there is a phenomenon that the workpiece P rotates together with the multi-tube heating tube 11 ′. In this case, there has been a problem that the drying efficiency of the workpiece P may not be sufficiently increased.
Here, the “co-rotation” means an event as shown below. That is, the tube bundle 116 ′ of the multi-tube heating tube 11 ′ is an object in which a large number of tubes are arranged at an appropriate interval and integrated into a bundle, but the object to be treated that stays in the main body shell 10 ′. It sinks into P and comes into contact with it, and heats the workpiece P to promote the evaporation of moisture.
Further, normally, the workpiece P is scraped up while being cascaded mainly by a plurality of lifters 117 ′ provided on the side periphery of the multi-tube heating tube 11 ′, and reaches the upper part of the main body shell 10 ′. At the same time, the tube contacts the tube located inside the tube bundle 116 'when falling from here, and drying is also promoted here.

  However, depending on the workpiece P1 that has been dried to some extent, the viscosity increases and the dispersion becomes difficult to be dispersed. Even after being positioned at the top, it will rotate with the multi-tube heating tube 11 'without sticking around the lifter 117' and falling. Such behavior of the workpiece P in the main body shell 10 'is referred to as "co-rotation" in this field.

By the way, in a conductive heat transfer dryer that dries materials such as mud, cake, and powder, the dry matter discharged from the dryer is used as a method to adjust the moisture value of the object being dried. There is known a method (see, for example, Patent Document 3) for feeding to a target position, or a method for returning an object to be processed immediately before being discharged from the dryer to the input side of the dryer (for example, see Patent Document 4 ). .
In these methods, a dried product or a nearly dried product is returned to the input side (upstream side) of the dryer. In either case, the dried product has a dry and tight property. Since the material to be treated located at the place where this is returned has a high moisture content and is soft, it is necessary to return a large amount of the dried product or take a long time to change both of them well into a property that is easy to dry. It was necessary to mix them. For this reason, the apparatus size (internal volume) of the dryer has been increased or the processing time has been prolonged.

JP, 2014-006017, A JP, 2015-081712, A JP S61-271099 A JP 2006-17335 A

  The present invention was made from such a background, and in a conduction heat transfer dryer provided with a multi-tube heating tube, while suppressing the increase in the size of the device and the processing time, Conductive heat transfer dryer with improved heat transfer efficiency to a new object to be processed, which can promote efficient drying of the object to be processed by avoiding the objects to be processed together, and its The development of operation method is a technical issue.

  In other words, the conduction heat transfer dryer having improved heat transfer efficiency to the object to be processed according to claim 1 is provided with a heating device in the main body shell, and the object to be processed is brought into contact with the heat transfer surface of the heating device so In the conduction heat transfer dryer that evaporates the heating device, the heating device is a multi-tube heating tube in which a rotation axis is set along the longitudinal direction of the main body shell. The object to be dried, which is scraped up by a plurality of lifters provided in the part, is extracted from the extraction port formed in the side peripheral part of the main body shell, and the object to be processed which has been dried is appropriately disposed in the main body shell. It is characterized by being configured to be able to be moved to the location.

  In addition to the above requirements, the conductive heat transfer dryer having improved heat transfer efficiency to the object to be processed according to claim 2 can be used to transfer the object to be processed, which has been extracted from the main body shell, to an appropriate amount in the main body shell. It is characterized by being configured so that it can be dispersed and / or dried before it is transferred into place.

  In addition to the above requirements, the conduction heat transfer drier having improved heat transfer efficiency to the object to be processed according to claim 3 is characterized in that the extraction ports are provided at a plurality of locations.

According to a fourth aspect of the present invention, there is provided an operation method for a conductive heat transfer dryer having improved heat transfer efficiency to a workpiece, wherein the heat transfer efficiency to the workpiece is improved. In the operation of the thermal dryer, the temperature of the object to be processed in the main body shell is measured by the temperature sensor, and if this temperature detection value tends to decrease or is less than a predetermined value, the co-rotation phenomenon due to the object to be processed It is determined that the material is being generated, and the extraction port formed in the side periphery of the main body shell is opened for a certain period of time or opened intermittently for a certain period of time, so that the object to be processed has been dried. If the temperature detection value is equal to or higher than the predetermined value and the temperature decreasing tendency does not continue for a predetermined time, the co-rotation phenomenon due to the object to be processed occurs. The outlet is closed Those comprising as a feature in that a state.
The above problems can be solved by using the configuration of the invention described in each of the claims as a means.

  First, according to the first aspect of the present invention, the workpiece to be dried has been extracted from an extraction port formed in the side peripheral portion of the main body shell, and moved to an appropriate location in the main body shell. The moisture content of the to-be-processed object located in can be reduced. As a result, it is possible to avoid the occurrence of the co-rotation phenomenon and to cascade the lifting of the object to be processed by the lifter in the main body shell, to improve the heat transfer efficiency to the object to be processed, and to improve the efficiency of the object to be processed. Drying can be promoted.

Further, according to the invention described in claim 2, more uniform mixing can be performed by moving the dried processed material extracted from the main body shell to an appropriate location in the main body shell in a dispersed state. Can do.
In addition, by reducing the moisture content of the processed material extracted from the main body shell, the moisture content of the processed material put into the main body shell can be further reduced, and more efficient drying of the processed material can be achieved. It can be further promoted.

Further, according to the third aspect of the present invention, the occurrence of the co-rotation phenomenon can be avoided more reliably by forming the extraction port at a portion where the co-rotation easily occurs in the main body shell.
In addition, when multiple inlets are provided, an extraction port is formed between each of the inlets and outlets to accurately extract an object that is likely to cause a common phenomenon. be able to.

  According to the invention of claim 4, it is determined whether or not the co-rotation phenomenon occurs due to the object to be processed by measuring the temperature of the object to be processed in the main body shell, and it is determined that the co-rotation phenomenon occurs or not. Sometimes, the moisture content of the object to be processed located in the main body shell is removed by removing the processed object that has been dried from the extraction port formed in the side periphery of the main body shell and moving it to an appropriate place in the main body shell. Can be reduced. As a result, it is possible to avoid the occurrence of the co-rotation phenomenon and to cascade the lifting of the object to be processed by the lifter in the main body shell, to improve the heat transfer efficiency to the object to be processed, and to improve the efficiency of the object to be processed. Drying can be promoted.

It is a front view which sees and shows a part of conduction heat-transfer dryer. It is the cross-sectional view which looked at the conduction heat transfer dryer from the left side, and the cross-sectional view which looked from the right side. FIG. 3 is a perspective view showing a part of a conductive heat transfer dryer. It is a block diagram which shows a conduction heat transfer dryer and peripheral devices. It is a front view which shows a partial see-through | perspective view of the conduction heat-transfer dryer which varied the re-input position of the to-be-processed object. It is a front view which shows a part seeing through the conduction heat-drying machine shown in other examples. It is a skeleton figure which shows the mode of the to-be-processed object's sending in the conduction heat transfer dryer shown in another Example. It is a front view which fractures | ruptures and shows the existing conduction heat-transfer dryer.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode of a conduction heat transfer dryer with improved heat transfer efficiency to an object to be processed and its operating method are as shown in the following examples. It is also possible to make appropriate changes within the scope of the ideal idea.

As shown in FIGS. 1 and 2, a conductive heat transfer dryer 1 (hereinafter, also referred to as a dryer 1) having improved heat transfer efficiency to an object to be processed according to the present invention is provided on a machine frame F as an example. The main body shell 10 is a chamber, and a multi-tube heating tube 11 as an example of a heating device is provided inside the main body shell 10 as shown in FIGS.
Then, the multi-pipe heating tube 11 is rotated while flowing the heating steam S3 as a heat medium in the multi-pipe heating tube 11, and the workpiece P put into the main body shell 10 is transferred to the outer surface of the multi-pipe heating tube 11 (heat transfer). The surface to be processed is dried by conducting heat to the workpiece P.
In the following description, the symbol of the workpiece that has been dried in the main body shell 10 is P1, and is distinguished as the workpiece P2 that is located at the destination to which the workpiece P1 is sent.

Further, the main body shell 10 is a hollow member having an elliptical cross section as shown in FIG. 2 as an example, and as shown in FIGS. 1 and 3, the inlet 101, outlet 102, carrier gas outlet 103, exhaust outlet. 104 is formed. An input port 101a, which is one of the input ports 101, is formed in the vicinity of one end of the main body shell 10, and an exhaust port 104 is formed in the vicinity of the input port 101a.
Further, a second inlet 101b is formed in a portion closer to the center than the exhaust port 104 in the main body shell 10, and in this embodiment, the input port 101 is formed in two places with the exhaust port 104 interposed therebetween. I did it. Of course, you may make it form the inlet 101 further in several places along the longitudinal direction of the multi-tube type heating tube 11 mentioned later.
As shown in FIG. 3, the discharge port 102 is formed by closing a rectangular opening formed in the main body shell 10 with a plurality of plate materials 102a having a width of about several tens of cm in order from the lower part to the upper part. It can be formed with the height dimension.
Since such a configuration is adopted, if the plate members 102a are stacked high, the opening of the discharge port 102 opens only narrowly in the upper part, so that the retention amount of the object P in the main body shell 10 is large as will be described later. Become. On the contrary, if there are few board | plate materials 102a, opening will become wide and the retention amount of the to-be-processed object P in the main body shell 10 will decrease so that it may mention later.

In addition, a duct 102b is externally covered so as to cover the discharge port 102, and a rotary valve 105 is provided in front of the discharge port 109 formed in the lower part of the duct 102b. Of course, a double damper discharge device or the like may be provided instead of the rotary valve 105.
The main body shell 10 and the multi-tube heating tube 11 are installed in the machine frame F so as to be horizontal or inclined so that the inlet 101 side is somewhat higher than the outlet 102 side.

  Furthermore, the main body shell 10 has a double jacket structure as an example, and a passage through which a heating medium passes from the steam supply port 106 to the drain port 107 is formed so that the temperature inside the main body shell 10 can be raised. It is taken. In addition, it can replace with such a double jacket structure and can also install trace piping. Further, the side opening 108 formed in the main body shell 10 is used when observing the inside of the main body shell 10 or the like, and is closed by an inspection lid in a steady state.

  Further, the main body shell 10 is configured on the assumption that it is used under normal pressure or slight negative pressure. Therefore, strict airtightness is not required, and a complicated input / discharge mechanism, supply / exhaust mechanism is required. Is not required. For this reason, the dryer 1 can be constructed at low cost.

The multi-tube heating tube 11 includes end plates 112 on both sides of a cylindrical tube bundle 116 and a hollow shaft 113 at the center of the end plate 112, and is provided in the machine frame F. The shaft body 113 is rotatably supported by the bearing block 114. A motor M is provided on the machine frame F as a power source for rotating the multi-tube heating tube 11.
Rotary joints 115 a and 115 b are attached to both ends of the shaft body 113 and connected to the tube bundle 116. In addition, a seal mechanism for blocking external air is provided between the outer surface of the shaft body 113 and the main body shell 10.
The tube bundle 116 has a plurality of angles 111 (12 in this embodiment) to which a plurality of lifters 117 and feed blades 118 having appropriate angles are attached. The workpiece P is scraped up as shown in FIG. 2 and comes into contact with the tube bundle 116 and proceeds from the inlet 101 side to the outlet 102 side.

Then, as a characteristic configuration of the present invention, the object P1 that has been dried is extracted from the main body shell 10 by the object extraction mechanism 12, and this object P1 is removed from the main body shell 10 at an appropriate location (in this embodiment). As an example, it is configured so that it can be sent to the slot 101).
Specifically, the structure of the workpiece extraction mechanism 12 is such that an extraction port 120 is formed in the lower part of the side periphery of the main body shell 10 in the cross-sectional view shown in FIG. It is formed between the inlet 101 and the outlet 102 in view. Specifically, the lower side periphery is defined as 0 ° on the right side in the horizontal direction from the center of the shaft body 113 in FIG. 2A, and 270 ° to 360 ° when viewed in the rotational direction (counterclockwise). It means a range.
The extraction ports 120 may be provided at a plurality of locations. In this embodiment, since the insertion ports 101 are formed at two locations along the longitudinal direction of the main body shell 10, the front surface shown in FIG. In view, the extraction ports 120 a and 120 b are formed between the input ports 101 a and 101 b and the discharge port 102.

Further, the extraction port 120 is opened and closed by a lid 121, and an opening and closing mechanism 122 for this purpose is shown in FIG. 3 as an example, a cylinder 122a, a link 122b connected to a rod of the cylinder 122a, The shaft 122c is rotated by the link 122b, and the lid 121 is connected to the shaft 122c.
The shaft 122c is supported by a bearing provided in the duct 123, which is externally mounted on the main body shell 10 so as to cover the extraction port 120.
The base end side of the cylinder 122a is fixed to a base 122d provided on the outer peripheral portion of the main body shell 10 as appropriate.

Furthermore, in this embodiment, the processed P1 that has been dried and extracted from the main body shell 10 through the extraction port 120 is dispersed and / or dried before being sent to an appropriate location (such as the input port 101) in the main body shell 10. The structure which can do is taken.
Specifically, the lower portion of the duct 123 is formed in a tapered shape, the tip of the duct 123 is an air supply port 124, a blower 124 a is connected to the air supply port 124, and the eye plate is above the air supply port 124. By providing 125, air blown from the blower 124a is applied to the workpiece P1 located on the countersink plate 125. The eye plate 125 is a plate having a large number of holes, and the material discharged on the plate can be made to flow by the gas discharged from the holes.
Further, an exhaust port 126 is formed in the upper part of the duct 123, and an air supply pipe 126a connected to the exhaust port 126 is connected to the upper part of the main body shell 10, whereby the gas supplied from the blower 124a is supplied to the main body shell. 10 is configured to enter the interior 10 and further exhaust from the exhaust port 104.

  In addition, an extraction port 123a is formed in the upper portion of the duct 123 above the eye plate 125, and an extraction path 127 is provided on the duct 123 so as to cover the extraction port 123a. The workpiece P1 whose moisture content has been lowered on the upper side overflows from the extraction port 123a, and is re-input to the input port 101 through the conveyor 128 and the conveyor 129 to which a rotary conveyor or the like is applied. It should be noted that the workpiece P1 can be introduced from the conveyor 129 into the input port 101 by appropriately providing a valve body such as a slide damper at the opening of the input port 101 and opening and closing the valve body. . Therefore, the dryer 1 shown in this embodiment has a configuration in which the workpiece P1 can be re-introduced into one or both of the upstream-side inlet 101a and the downstream-side inlet 101b.

It should be noted that the portion where the re-input is performed may be a different portion along the longitudinal direction of the main body shell 10, which will be described later.
Further, the part to be recharged can be a part other than the above-mentioned inlet 101. For example, as shown in FIG. It can also be set as the arbitrary position of the main body shell 10 by connecting to 101d. In the dryer 1 shown in FIG. 5, the conveyors 128 and 129 in the workpiece extraction mechanism 12 are individually provided for the extraction ports 120 a and 120 b, respectively, and the transfer destination by the conveyor 129 is the extraction port 120. It is assumed that it is fixed upstream. In addition, the structure which connects the pneumatic transport pipe which pneumatically transports the to-be-processed object P1 which falls from the extraction path 127 to the transfer ports 101c and 101d without using the conveyors 128 and 129 can also be taken.

  Next, the charging device 2 will be described. As an example, a monopump having a hopper 20 as shown in FIG. 4 is applied, and the discharging port is appropriately connected to the charging port 101 in the dryer 1. Connected by route.

  Next, the bag filter 3 will be described. In this embodiment, a shaking type bag filter is adopted as an example, and is connected to the exhaust port 104 in the main body shell 10. The filter element 30 can be vibrated by an appropriate swing mechanism to remove clogged dust and the like. In addition, various types such as a backwash type can be used as the bag filter 3.

The rotary joint 115a is supplied with heating steam S for heating the multi-tube heating pipe 11, and this heating steam S is a steam pipe path provided with a pressure reducing valve 83 and a flow rate adjusting valve 84. Supplied from
The pressure of the heating steam S is adjusted to 0.1 to 0.7 MPaG (corresponding to a temperature of 120 to 170 ° C.) according to the workpiece P.

  In addition, the pump 91 provided on the downstream side of the rotary joint 115b can be operated to discharge the drain D generated in the multi-tube heating tube 11 and non-condensable gas such as air that has entered due to leakage. It is configured as follows.

  The conduction heat transfer dryer 1 of the present invention is configured as described above as an example, and hereinafter, in combination with the operation mode of this apparatus, the conduction heat transfer drying with improved dispersibility of the object to be processed of the present invention. The operation method of the machine 1 will be described.

(1) Activation of exhaust equipment First, the exhaust S1 exhausted from the bag filter 3 contains moisture, odor components, and the like that evaporate from the workpiece P. Therefore, an appropriate exhaust treatment equipment (not shown) is used. Start up.

(2) Preparation of the dryer Next, before the workpiece P is charged, the temperature of the multi-tube heating tube 11 and the main body shell 10 in the dryer 1 is raised. The heated steam S is supplied to the rotary joint 115a and the steam supply port 106 in a state where the heating pipe 11 is rotated.
In preparing the dryer 1, the pump 91 provided on the downstream side of the rotary joint 115 b is operated to discharge the drain D generated in the multi-tube heating tube 11, air that has entered due to leakage, or the like. Of non-condensable gas.
Thereafter, the pump 91 is stopped, the temperature control valve 93 is opened, and the non-condensable gas is discharged by the pump 92.

(3) Supply of carrier gas Subsequently, as an example, after the outside air as the carrier gas C is subjected to dust removal using a filter (not shown), it is further about 100 ° C. (processed material P And is supplied into the main body shell 10 from the carrier gas port 103.

(4) Activation of blower Next, the blower 124a for supplying gas (for example, outside air) to be supplied to the workpiece extraction mechanism 12 is activated. Although not particularly shown, the outside air is subjected to dust removal using a filter according to the properties of the workpiece P or heated by a heating device.
In addition to the outside air, a part of the exhaust S1 exhausted from the bag filter 3 may be sucked by the blower 124a and supplied to the workpiece extraction mechanism 12.
Further, an unillustrated supply for supplying an exhaust air amount such as an exhaust fan attached to the exhaust equipment and a carrier gas C so that the pressure in the main body shell 10 where the object P is retained is slightly negative from the atmospheric pressure. The amount of air supplied by a fan or the like and the amount of air supplied by the blower 124a are adjusted with an appropriate balance.

(5) Drying of the object to be processed Next, the object to be processed P is thrown into the main body shell 10 from the charging device 2 through the charging port 101, and this is moved from the charging port 101 side by the action of the feed blade 118 and the lifter 117. In addition to moving toward the discharge port 102 and being further swung up while being cascaded by the lifter 117 or the like, the tube bundle 116 is effectively contacted. At this time, moisture is evaporated by heat and the water content is reduced. It is.
At this time, the distribution state of the processing object P1 in the main body shell 10 is a state in which it is raised and unevenly distributed in the rotational direction as the multi-tube heating tube 11 rotates as shown in the cross-sectional view of FIG. Yes, including such a state, the workpiece P1 is said to be located below the main body shell 10.
In the operation of the dryer 1 as described above, the tube bundle 116 of the multi-tubular heating tube 11 comes into contact with the processing object P1 positioned below the main body shell 10 so as to be processed. The object P1 is heated to promote the evaporation of moisture.
Further, the workpiece P1 is raked up while being cascaded by a plurality of lifters 117 provided on the side peripheral portion of the multi-tube heating tube 11, reaches the upper part in the main body shell 10, and when dropped from here, the tube It contacts the tube located inside the bundle 116 and again encourages drying.

Further, as described above, the outside air as the carrier gas C flows into the main body shell 10 from the carrier gas port 103, and the moisture evaporated from the workpiece P1 is brought along with the carrier gas C to quickly Are discharged from the exhaust port 104 to the outside.
At this time, fine powder or the like contained in the carrier gas C discharged from the exhaust port 104 is separated in the bag filter 3.

Then, the drain D generated by condensing the heated steam S by losing sensible heat and latent heat in the tube bundle 116 is pushed out from an appropriate drain discharge pipe (not shown) provided in the end plate 112 on the discharge port 102 side, It is discharged to the outside of the dryer 1 through the shaft body 113 and the rotary joint 115b, is roughly separated into drain D and gas by the separator 94, and is discharged through the respective paths.
On the other hand, the workpiece P1 that has reached the discharge port 102 is discharged by a rotary valve 105 that is activated at an appropriate timing in a dry product state.

(6) Extraction of processing object that has been dried and returning to the main body shell As described above, the processing object P introduced into the main body shell 10 through the input port 101 is dried as it moves to the discharge port 102 side. The to-be-processed object P1 (water content 30 to 40% WB) that has been dried to some extent often has increased viscosity and may be in a hardly dispersed state.
Further, as described in [Background Art], the object to be processed P1 in this state is caused by the compacting action generated in the gap between the inner surface of the main body shell 10 and the rotating lifter 117, the angle 111, or the multi-tube heating tube 11. Rather than being swung up while being cascaded by the lifter 117 in the main body shell 10, it is lifted up in a lump-like attached state, and even after being positioned at the upper part, it does not stick to the periphery of the lifter 117 or the like and fall. It may be rotated together with the tubular heating tube 11.

In the stage before such co-rotation occurs, in the present invention, the workpiece P1 is extracted from the outlet 120.
In this embodiment, as an example, the temperature sensor 73 is attached to the upstream side of the outlet 120 in the main body shell 10 (on the left side of the outlet 120 and to the left of the duct 123 as shown by the hatched line in FIG. 1). While measuring the temperature of the to-be-processed object P in the shell 10, the situation of the co-rotation phenomenon by the to-be-processed object P1 was judged by this temperature.
That is, when the temperature detection value by the temperature sensor 73 tends to decrease or is less than a predetermined value, it is determined that the co-rotation phenomenon due to the object to be processed is occurring, while the temperature detection value is greater than or equal to the predetermined value. In the case where the temperature decreasing tendency does not continue for a predetermined time, it is determined that the co-rotation phenomenon due to the object to be processed has not occurred.
In addition to the method using the temperature sensor 73 as described above, the moisture content of the workpiece P1 can be measured using a moisture meter, and the moisture content can be used for determining the occurrence of the co-rotation phenomenon. Similarly, the current value of the motor M rotating the multi-tube heating tube 11 is measured, and when this value does not continue the current increasing tendency for a predetermined time, it is determined that the co-rotation phenomenon has not occurred. You can also do here.
Further, it is possible to perform an operation such that the lid 121 of the sampling port 120 is opened and closed at regular intervals so that no co-rotation occurs.

When the workpiece P1 is extracted according to the determination that the co-rotation phenomenon is occurring, the opening / closing mechanism 122 is operated and the cylinder 122a is contracted to rotate the shaft 122c. The lid 121 is separated and the extraction port 120 is opened. When the multi-tube heating tube 11 rotates in this state, the workpiece P1 positioned in the lower part of the main body shell 10 flows out from the extraction port 120 into the duct 123 and is positioned on the eye plate 125. .
When an appropriate amount of the processing object P1 flows out of the extraction port 120, the shaft 122c is rotated by extending the cylinder 122a, the lid 121 is brought into close contact with the extraction port 120, and the extraction port 120 is closed. .
At this time, the outside air supplied from the blower 124a acts on the workpiece P1 located on the eye plate 125, reduces the moisture content of the object P1, and acts on the outside air discharged from the eye plate 125. dispersed to flow through (loosened), extravasated from the object to be treated P1 is extracting hole 123a dispersed, conveyor 128 rotary conveyor or the like is applied, it is again charged in the inlet 101 through the conveyor 129.

  And since the to-be-processed object P1 is extracted from the extraction port 120 in this way, since the pressure of consolidation is relieved in the periphery of the extraction port 120 in the main body shell 10, the fall of the dispersibility of the to-be-processed object P1 is suppressed. Alternatively, it is conceivable that the retention amount of the object P1 near the extraction port 120 may decrease, or it may act to relieve the pressure of consolidation, and the co-rotation phenomenon is surely avoided and the lifter 117 in the main body shell 10 is used. It is possible to cascade the scraping of the workpiece P and promote efficient drying of the workpiece P.

In addition, by sending the workpiece P1 extracted from the extraction port 120 to the input port 101 of the main body shell 10, the moisture content of the workpiece P2 located at the destination is substantially reduced, and the efficiency of the workpiece P is improved. Drying can be promoted. That is, the processing object P1 taken out from the extraction port 120 has a lower moisture content than the processing object P2 located upstream from the extraction port 120, and the processing object P1 taken out from the extraction port 120, When the upstream workpiece P2 is mixed, the moisture content of the portion is lowered, and the contact efficiency with the tube bundle 116 is improved by the effect.
Therefore, as disclosed in Patent Documents 3 and 4, unlike the case of returning a dry product or a nearly dry product, the workpiece P1 taken out from the extraction port 120 and the workpiece P2 positioned upstream are used. Since the physical properties are close, they are easy to mix in a short time and do not require time for mixing or much area for it (internal volume for mixing).
As described above, in this embodiment, the extraction port 120 is provided in the main body shell 10 in a region where co-rotation is likely to occur, specifically, between the two input ports 101a and 101b and the discharge port 102, respectively. By forming the extraction openings 120a and 120b, it is possible to accurately extract the workpiece P1 that is likely to fall into a difficult dispersion state that may co-rotate, and to eliminate the co-rotation phenomenon more reliably.

The above-described extraction of the workpiece P1 and return to the main body shell 10 are performed by sending the workpiece P1 extracted from the upstream extraction port 120a to the upstream inlet 101a and extracting it from the downstream extraction port 120b. The processed object P1 is sent to the downstream inlet 101b. Therefore, the processed object P1 extracted from the extraction port 120a and the processed object extracted from the extraction port 120b on the conveyors 128 and 129. The thing P1 is not mixed.
On the other hand, it is possible to operate so that the workpiece P1 extracted from the extraction port 120a and the workpiece P1 extracted from the extraction port 120b are mixed on the conveyors 128 and 129. In this case, the processed material P1 extracted from the downstream extraction port 120b has a lower water content than the processed material P1 extracted from the upstream extraction port 120a. P1 has a moisture content lower than that of the workpiece P1 extracted from the upstream extraction port 120a. Then, by sending the mixed workpiece P1 to the upstream inlet 101a, the workpiece P2 positioned at the destination is compared with the case where the workpiece P1 is extracted only from the extraction port 120a. The moisture content can be lowered further, and the efficient drying of the workpiece P can be further promoted.
A method for reducing the moisture content of the workpiece P1 on the conveyors 128 and 129 more effectively will be described later in another embodiment.

[Other Examples]
The present invention is based on the above-described embodiment, but the following embodiment can also be adopted.
First, in the basic embodiment described above, the places to which the dried workpiece P1 is moved are the inlets 101a and 101b, and the workpiece P1 is moved upstream of the extraction ports 120a and 120b, respectively. The part to which the workpiece P1 is moved can be the following part.
In this embodiment, the dryer 1A shown in FIG. 6 is used as an example, which is different from the dryer 1 shown in FIG. 1 in terms of the transfer ports 101e, 101f, 101g and the sampling port 120c. The workpiece extraction mechanism 12 corresponding to the extraction port 120c is added, and the conveyors 128 and 129 and the blower 124a are connected to them.
Hereinafter, three different operation methods using such a dryer 1A will be described.

(1) Example of moving the workpiece to the downstream side from the sampling port First, the workpiece P1 extracted from the sampling port 120 is transferred to the downstream side (right side in FIG. 6) from the sampling port 120. An example will be described.
In addition, the staying state of the workpiece P in the dryer 1A (main body shell 10) during operation will be described. The staying amount tends to be large on the input port 101a side and small on the discharge port 102 side. The situation where the amount of stay is small on the 102 side causes a reduction in the contact efficiency between the workpiece P and the tube bundle 116.
However, when the workpiece P1 extracted from the extraction port 120 is moved into the main body shell 10 on the downstream side of the extraction port 120, more specifically, the workpiece P1 extracted from the extraction port 120a is transferred. When the material P1 extracted from the extraction port 120b is input to the input port 101b and / or when the workpiece P1 extracted from the extraction port 120b is input to the transfer port 101e, the retention amount on the discharge port 102 side is increased. The contact efficiency between the processed product P2 and the tube bundle 116 is improved.
Further, since the object P1 taken out from the extraction port 120 and the physical property of the object P2 positioned downstream are close to each other, they are easy to mix in a short time, and the time for mixing or many areas for it ( No internal volume is required for mixing.
Even when the workpiece P1 extracted from the extraction port 120a is input to the input ports 101g and 101e, the retention amount on the discharge port 102 side is increased.

(2) Embodiment in which the workpiece is moved on the same axis as the extraction port Next, an embodiment in which the workpiece P1 extracted from the extraction port 120 is returned to the position on the same axis as the extraction port 120 will be described.
Specifically, as shown in FIG. 7, for example, a transfer port 101 f is provided on the side wall surface opposite to the side wall surface where the extraction port 120 is provided in the same cross section of the main body shell 10, or the main body shell 10. The form which provides the transfer port 101g in the top part of is taken.
The workpiece P1 located in the main body shell 10 receives pressure between the inner wall of the main body shell 10 and the rotating lifter 117 and the tube bundle 116 (because of the action of consolidation), and therefore the extraction port 120. The pressure is released at the time of removal from the plate, and is effectively dispersed by the action of the outside air discharged from the eye plate 125. For this reason, even if the workpiece P1 taken out from the sampling ports 120a and 120b is put into the transfer ports 101f and 101g and moved to a position on the same axis (within the same cross section) as the sampling port 120, The effect of improving the contact efficiency between the object P1 and the tube bundle 116 is obtained.

(3) Example of mixing workpieces having different moisture contents in the conveyor Next, in the conveyors 128 and 129, the workpiece P1 extracted from the extraction port 120c formed near the discharge port 102 is extracted from the extraction port 120c. An example of mixing with the workpiece P1 extracted from the upstream side will be described.
Specifically, as an example, the workpiece P1 extracted from the extraction port 120c and the workpiece P1 extracted from the extraction port 120a are mixed on the conveyors 128 and 129.
In this case, the workpiece P1 extracted from the downstream extraction port 120c has a significantly lower water content than the workpiece P1 extracted from the upstream extraction port 120a. The processed product P1 has a moisture content that is significantly lower than the processed product P1 extracted from the upstream extraction port 120a. Then, by sending the mixed workpiece P1 to the upstream inlet 101a, the workpiece P2 positioned at the destination is compared with the case where the workpiece P1 is extracted only from the extraction port 120a. The moisture content can be lowered further, and the efficient drying of the workpiece P can be further promoted.
In addition, the to-be-processed object P1 extracted from the extraction port 120c and the to-be-processed object P1 extracted from the extraction port 120b are mixed on the conveyors 128 and 129, or the to-be-processed object P1 extracted from the extraction port 120c and the extraction port You may make it mix the to-be-processed object P1 extracted from 120a and the extraction port 120b on the conveyors 128 and 129. FIG.

1 dryer (conduction heat transfer dryer)
1A dryer (conduction heat transfer dryer)
DESCRIPTION OF SYMBOLS 10 Main body shell 10B Side plate 101 Input port 101a Input port 101b Input port 101c Transfer port 101d Transfer port 101e Transfer port 101f Transfer port 101g Transfer port 102 Discharge port 102a Plate material 102b Duct 103 Carrier gas port 104 Exhaust port 105 Rotary valve 106 Steam supply port 107 Drain port 108 Side opening 109 Discharge port 11 Multi-tube heating tube (heating tube)
111 Angle 112 End plate 113 Shaft body 114 Bearing block 115a Rotary joint 115b Rotary joint 116 Tube bundle 117 Lifter 118 Feed blade 12 Object extraction mechanism 120 Extraction port 120a Extraction port 120b Extraction port 120c Extraction port 121 Lid 122 Opening mechanism 122a Cylinder 122b Link 122c Shaft 122d Base 123 Duct 123a Extraction port 124 Air supply port 124a Blower 125 Dish plate 126 Exhaust port 126a Air supply tube 127 Extraction path 128 Conveyor 129 Conveyor 2 Input device 20 Hopper 3 Bag filter 30 Filter element 73 Temperature sensor 83 Pressure reducing valve 84 Flow control valve 91 Pump 92 Pump 93 Temperature control valve 94 Separator C Carrier gas D Drain F Machine frame M Mo P treatment object P1 processing object P2 object to be treated S heated steam S1 exhaust

Claims (4)

In the conduction heat transfer dryer, which is provided with a heating device in the main body shell, and evaporates water by bringing the workpiece into contact with the heat transfer surface of the heating device,
The heating device is a multi-tube heating tube in which a rotation axis is set along the longitudinal direction of the main body shell,
During operation, the dried processed material scraped up by a plurality of lifters provided on the side periphery of the multi-tube heating tube is extracted from an extraction port formed on the side periphery of the main body shell,
A conduction heat transfer drier with improved heat transfer efficiency to the object to be processed, characterized in that the object to be processed can be moved to an appropriate location in the main shell.
2. The structure according to claim 1, wherein the object to be processed, which has been extracted from the main body shell and has been dried, can be dispersed and / or dried before being transferred to an appropriate location in the main body shell. A conduction heat transfer dryer with improved heat transfer efficiency to the workpiece.
3. The conduction heat transfer dryer with improved heat transfer efficiency to the object to be processed according to claim 1, wherein the extraction port is provided at a plurality of locations.
In the operation of the conductive heat transfer dryer with improved heat transfer efficiency to the object to be processed according to claim 1, 2, or 3,
The temperature sensor measures the temperature of the workpiece in the main shell,
When this temperature detection value tends to decrease or is less than a predetermined value, it is determined that a co-rotation phenomenon due to the object to be processed is occurring, and the sampling port formed in the side periphery of the main body shell is fixed. By performing an operation that opens for a period of time or an operation that opens intermittently for a certain period of time, the dried object to be processed is moved to an appropriate location in the main body shell,
On the other hand, when the temperature detection value is equal to or higher than the predetermined value and the temperature decreasing tendency does not continue for a predetermined time, it is determined that the co-rotation phenomenon due to the object to be processed has not occurred, and the extraction port is closed. An operation method of a conduction heat transfer dryer that improves heat transfer efficiency to an object to be processed, characterized in that the state is left as it is.

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